Type certificate TC 121
Held today by Air Repair INC., earlier by Jacobs Service Company. It covers 2 models. Last revised January 2, 2002 (revision 1). 5 approved modifications build on it.
Models under this certificate 2
L-4, L-4 Series
The data sheet on the FAA's site: the approved engines and propellers, weights, speeds and limits for each model.
FAA orders on these designs 0 · newest first
None in the current files.
Approved modifications 5 · companies holding the most
Source: FAA type certificate data sheets (Dynamic Regulatory System); register counts from the FAA register of October 5, 2026. Connections as data: /graph/certificate/TC 121.json.